Statistical Characteristics of Scattered Radiation in Medium With Spatial-temporal Fluctuations of Electron Density and External Magnetic Field

Jandieri, G. V.; Zhukova, Natalia; Takidze, Irma; Jandieri, Ivane V.

doi:10.4236/jemaa.2012.46034

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…characteristic temporal scale of elongated plasmonic structures. If from (8) we obtain [18][19][20]. Rewrite (7) in nondimensional parameters, is the frequency of the ionospheric irregularities.…”

Section: Discussionmentioning

confidence: 99%

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Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru

Rawat

et al. 2022

AEM

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Using WKB method the peculiarities of the temporal spectrum of an ordinary and extraordinary electromagnetic wave scattered in a weakly randomly inhomogeneous three-dimensional nonstationary and conductive magnetized plasma are investigated. On the basis of the stochastic differential transport equation for the frequency fluctuation the broadening and the displacement of the temporal spectrum for both waves are obtained for the polar terrestrial ionosphere. These statistical characteristics contains anisotropic parameters: velocity of a plasma stream, conductivities of the ionosphere, elongated electron density irregularities are characterized by the anisotropy factor and inclination angle with respect to the geomagnetic lines of forces. The analysis of the power spectrum of the waves as a function of the propagation distance and the nondimensional frequency parameter containing the carrier frequency and characteristic temporal scale of electron density fluctuations are carried out. Analytical and numerical calculations have shown that the terrestrial conductivity and anisotropy factors exert a substantial influence on evaluation of the temporal spectrum than the inclination angle. It was found that the wave spectrum increases initially as the square root of the propagation distance, but at large distances it approaches a limiting value. Statistical moments of a scattered ordinary and extraordinary waves do not depend on an absorption sign and valid for both absorptive and active media.

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Section: Discussionmentioning

confidence: 99%

“…This imposes any restrictions on the distance travelling by wave in random medium. Broadening and shift of maximum of the spatial power spectrum of scattered electromagnetic waves in the geometrical optics approximation were considered in [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru

Rawat

et al. 2022

AEM

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show abstract

“…In this case correlation function decreases sharply as ρ x and ρ y increase. We can transform Equation ( 13) expanding the argument of the second exponential in a series [6,8,9,15]:…”

Section: Statistical Characteristics Of a Scattered Radiationmentioning

confidence: 99%

“…This characteristic is equivalent to the ray intensity (brightness) in radiation transport equation [15,16].…”

Section: Statistical Characteristics Of a Scattered Radiationmentioning

confidence: 99%

Compensation Effect in the Conductive Auroral Regions of the Terrestrial Atmosphere

Jandieri¹,

Ishimaru²,

Mchedlishvili³

2021

PIER M

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Oblique incidence of small-amplitude electromagnetic wave on an anisotropic conductive collision semi-infinite turbulent plasma slab under the influence of a homogeneous magnetic field is considered. The conditions of both the ordinary and extraordinary waves' propagation along and transversal directions with respect to the external magnetic field in a homogeneous absorbing collisional magnetoplasma are obtained. Second order statistical moments of the spatial power spectrum of a scattered radiation in the polar ionosphere are calculated for the arbitrary correlation function of electron density fluctuations using the geometrical optics approximation. External magnetic field, oblique incidence of electromagnetic wave on a plasma slab, anisotropy of both ionospheric conductivity and dielectric permittivity, also elongated plasma irregularities in the auroral region of the terrestrial atmosphere are taken into account. The direction along which these asymmetric factors compensate each other is established. The conditions of the "Compensation Effect" are obtained: the spatial power spectrum not broadens, and its maximum is not displaced. Second order statistical moments of a scattered radiation: the shift of maximum and the broadening of the spatial power spectrum in the main and perpendicular planes are investigated analytically and numerically for the power law spectrum of the anisotropic ionospheric plasmonic structures using the experimental data.

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“…In the study by Jandieri et al [5][6][7][8][9][10] , peculiarities of the spatial power spectrum (SPS) of radio waves in the polar ionosphere were investigated by applying ray approximation. It has been established that randomly varying electron density and the ambient magnetic field and the anisotropy and dip angle of elongated inhomogeneities relative to the ambient magnetic field may increase the intensity of the frequency fluctuations of propagating radio waves in the terrestrial ionospheric plasma.…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of the Temporal Spectrum of Scattered Radiation in the Equatorial Ionosphere

Jandieri

Tugushi

2023

j. of environ. & earth. sci.

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On the basis of the solution of the space-time characteristic system by the method of geometric optics using symbolic calculations, analytical and numerical simulation of the propagation of the ordinary and extraordinary radio waves in the conducting equatorial ionospheric plasma was made considering the anisotropy of plasma irregularities and non-stationary nature of propagation medium. Broadening of the spectrum and the displacement of its maximum contain velocity of a turbulent plasma flow and parameters characterizing anisotropic plasmonic structures. Statistical moments of both radio waves do not depend on the absorption sign and are valid for both active and absorptive random media. Temporal pulsations and conductivity of a turbulent ionospheric plasma have an influence on the evaluation of the spectrum-varying propagation distances travelling by these waves. The new double-humped effect in the temporal spectrum has been revealed for the ordinary wave varying anisotropy coefficient and dip angle of stretched plasmonic structures. From a theoretical point of view, the algorithms developed in this work allow effective modelling of the propagation of both radio signals in the equatorial conductive ionospheric plasma, considering the external magnetic field, inhomogeneities of electron density in-homogeneities, as well as non-stationary.

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Statistical Characteristics of Scattered Radiation in Medium With Spatial-temporal Fluctuations of Electron Density and External Magnetic Field

Cited by 4 publications

References 10 publications

Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma

Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma

Compensation Effect in the Conductive Auroral Regions of the Terrestrial Atmosphere

Statistical Characteristics of the Temporal Spectrum of Scattered Radiation in the Equatorial Ionosphere

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